I want to write a few lines about the luggage limit that you can take on a cruise, since although it is true that there is no restriction as in the airlines, by common sense it is not about moving with all the clothes.
Especially for a practical matter and that is cabins and their cabinets are small (In some cases I would dare to say that it is very small), and you will not be able to move comfortably with the suitcases in between, or you will have to leave part of the things in the suitcase itself.
Anyway, I am going to give you some ideas of the fundamentals in your suitcase when going on a cruise.
The first thing is that (as it happens when you fly) I recommend that you bring a carry-on suitcase with the essentials, a couple of changes, the swimsuit, the toiletries and pajamas. This is in case the luggage takes a while to reach the cabin, and you can start to enjoy the trip without stress.
Find out well about the weather in the destination places, do not get preconceived ideas, in the Caribbean it also rains.
One advantage is that each time cruise ships are being less picky about their etiquette, even those who are luxurious are opening their hands. Although yes, the gala dinner or dinner with the captain still requires a cocktail suit for them (at least) and a suit for them. If you don't want to accept this formality, well, you can decline the invitation and have dinner at another restaurant on the ship that night. Remember, it is your trip and you decide to enjoy it your way.
Also keep in mind that large ships have a gym, swimming pools, mini golf courses, sports fields, ... that is ...Put some sports shoes and clothes that dry quickly in the suitcase, because there will be opportunities to play sports.
I hope these tips have helped and encouraged you to go on a cruise, whatever its duration it is always an unforgettable experience.